EP1891268A1 - Blade apparatus and method of manufacture therefor - Google Patents
Blade apparatus and method of manufacture thereforInfo
- Publication number
- EP1891268A1 EP1891268A1 EP05731170A EP05731170A EP1891268A1 EP 1891268 A1 EP1891268 A1 EP 1891268A1 EP 05731170 A EP05731170 A EP 05731170A EP 05731170 A EP05731170 A EP 05731170A EP 1891268 A1 EP1891268 A1 EP 1891268A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- belt
- edge
- web
- web layers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G3/00—Doctors
- D21G3/005—Doctor knifes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
- Y10T428/24612—Composite web or sheet
Definitions
- This invention relates generally to an industrial blade apparatus for use in papermaking and other manufacturing processes. More particularly, the present invention relates to a doctor blade fabricated from a thick felt having an angled edge coated with polyurethane.
- Pulp or papermaking machines utilize a variety of components during the pulp or papermaking process. These components include, for example, belts, presses and machine rolls. Machine rolls are used during various aspects of the pulp or papermaking process, for example, forming, pressing, drying and/or calendering operations.
- a doctor blade may be instrumental in removing excess water from the belt.
- Doctor blades can be of rigid or flexible design depending upon the desired application. Also, doctor blades are typically removable and therefore replaceable when worn out.
- the doctor blade is typically fastened to a structural beam that is adjustably supported across the papermaking machine on which a blade holder and a blade is provided.
- the doctor blade comes in direct contact with the roll surface to scrape off any contaminants from the roll surface including the whole pulp or paper web sheet or parts thereof.
- European Patent Application EP 1 295 988 by Takeuchi et al. entitled, "Doctor Blade” relates to a doctor blade fabricated from an integrated base material and batt fiber layers. Resin is impregnated into one side of the fibrous laminate, hi use, the layer in which the amount of resin is small is in contact with a belt.
- This application is hereby incorporated by reference in its entirety herein.
- European Patent Application EP 1 298 250 by Takeuchi et al., entitled, "Doctor Blade” relates to a doctor blade with a resin impregnated into a fibrous laminate that includes base materials and batt layers integrated by needle punching. This application is hereby incorporated by reference in its entirety herein.
- EP 1 342 842 by Takeuchi et al., entitled, "Doctor Blade for Removing Water” relates to a laminated, resin- impregnated doctor blade for removing water from a grooved belt. Fibers of the belt-contacting layer are oriented in the direction of travel of the belt. This application is hereby incorporated by reference in its entirety herein.
- a doctor blade of the type above for removing water and other contaminants undesirably wears, or abrades, the grooved belt surface.
- This wear is typically due to polyester, also referred to as PET herein or glass fibers in the doctor blade, which, when impregnated with a hard resin, cause a hard grinding surface to be in contact with the softer belt surface, usually made of polyurethane resin, also referred to as PUR herein.
- a second source of surface wear of the grooved belt is contaminants or foreign particles such as calcium carbonate (CaCO 3 ) that become trapped or lodged in damaged areas on a doctor blade caused by pitting or bending of the blade. This further exacerbates the grinding on the belts, thereby reducing operational life of the belt.
- CaCO 3 calcium carbonate
- transfer belts increases the need for an improved doctor blade over the type described above.
- the surface of a transfer belt is softer and more compilable than a shoe press belt. Since a transfer belt is in direct contact with a paper web, its surface can pick up
- a transfer belt's surface Prior to entering a press nip, a transfer belt's surface must be relatively dry in order to minimize loss in dewatering efficiency as well as minimize the thickness of the water film created on the belt surface so as to prevent incipient crushing of the paper web and/or to allow the water film to break up resulting in the paper sheet being released from the transfer belt. Additionally, the transfer belt's surface cannot be unevenly worn or scored/scratched by a contaminant embedded in the edge of a doctor blade. An unevenly worn transfer belt will cause nonuniform pressure to be applied to the paper web that can affect both sheet dewatering and sheet transfer. A scored/scratched belt will result in a mark on the paper sheet.
- the present invention is directed toward an industrial blade, such as a doctor blade, having a surface that minimizes the wear of a surface of a component that the blade contacts, thereby increasing the operational life of the component.
- one embodiment of the present invention relates to an industrial blade that includes a plurality of web layers, with each web layer formed from a mixture of polyamide and copolyester. An edge of the web layers also has a polyurethane coating and the blade is fabricated to have an angled portion.
- Another embodiment of the present invention relates to a method of manufacturing a blade.
- the method includes providing a plurality of web layers, each web layer formed from a mixture of polyamide and copolyester.
- the plurality of web layers is needled to form a thick felt, which is then calendered.
- Polyurethane is applied to an edge of the thick felt, and an angled surface is formed on the edge after a predetermined period of time.
- FIG. 1 shows a perspective view of a blade, according to the present invention, that may be used in papermaking and pulp making machines;
- FIG. 2 illustrates web layers for fabricating the blade;
- FIG. 3 illustrates a needling process for the web layers
- FIG. 4 illustrates a hot calendering process of a thick felt
- FIG. 5 illustrates a polyurethane treatment of a region of the thick felt
- FIG. 6 illustrates the edge region being cut at an angle
- FIG. 7 shows an example of dimensions of a blade according to the present invention
- FIG. 8 shows an example of an installed blade of the present invention.
- FIG. 9 shows a comparison of abrasion test results for a belt using a conventional blade and using a blade according to the present invention.
- the present invention provides an improved doctor blade and a method of manufacturing such a blade.
- the present invention addresses the issue of belt wear resulting from a surface of the doctor blade in contact with a softer belt such as one made from polyurethane (PUR).
- PUR polyurethane
- the present invention also addresses the issue of contaminants or foreign particles, that become trapped or lodged in a damaged edge of a
- the present invention provides an improved doctor blade by eliminating PET fibers or glass fibers from the blade and constructing a doctor blade from a fiber mixture of polyamide (PA) and copolyester.
- PA polyamide
- copolyester This mixture provides a softer and less abrasive surface that contacts the surface being doctored, such as a belt or roll cover.
- the fibers are mixed and needled to form a thick felt, which is then cut in long strips.
- the strips are then hot pressed or calendered at a sufficiently high temperature (e.g. 200° C or more) to achieve the required hardness and stiffness characteristics necessary for a desired application, such as papermaking or other manufacturing process that utilize doctor blades.
- a sufficiently high temperature e.g. 200° C or more
- one or more edges of the thick felt is cut at a desired angle, for example an angle between approximately 25 degrees and 80 degrees from a longitudinal axis of the thick felt, and preferably approximately 45 degrees.
- the blade may be mounted in a fixed or flexible manner such as in a doctor mounting or doctor back so that the doctor blade interacts in a desired mariner with the surface being doctored, for example a belt or roll cover.
- the blade particularly the blade edge in contact with a belt or roll cover, is resistant to penetration by undesired contaminants or foreign particles.
- This resistant characteristic is accomplished by treating a region of the blade, typically a region that includes the portion cut at an angle, with polyurethane.
- the treatment process seals the blade edge and reduces introduction of foreign
- FIG. 1 shows a perspective view of a blade 10, fabricated according to the present invention that may be used in papermaking and pulpmaking machines.
- Blade 10 has a body portion 132.
- the blade has an upper surface 131, which typically contacts a belt or other surface for doctoring purposes, for example, to remove water, and a lower portion 133, which is typically used to secure the blade 10 to a mounting apparatus or guide arm or other support structure (not shown).
- FIG. 2 illustrates web layers 115 for fabricating the blade body 10 according to the present invention.
- the blade 10 is fabricated from a plurality of web layers 102, 104, 106, 108 and 110. As shown in FIG. 2, web layers 106, 108 and 110 are already assembled with web layers 102 and 104 being applied to the upper and lower surfaces, respectively.
- FIG. 3 illustrates a needling process to form a thick felt 130.
- Web layers 102, 104, 106, 108 and 110 are assembled to form a stack of web layers, 140.
- the stack 140 is needled with material 120 and 122 on the upper and lower surfaces, respectively, to form a thick felt 130.
- FIG. 4 illustrates a hot calendering process of the thick felt 130.
- the thick felt 130 (from FIG. 3) is calendered using rollers 134(a) and 134(b). As shown in FIG. 4, portion 130(a) represents the thick felt prior to a calendering operation and portion 130(b) represents the thick felt after a calendering operation.
- FIG. 4 illustrates a needling process to form a thick felt 130.
- FIG. 5 illustrates a polyurethane treatment of an edge region of the thick felt 130.
- 00237907 treatment process is typically accomplished by soaking the portion 140 with the treatment compound. As shown in FIG. 5, the treatment material 136 is absorbed or adhered, as shown by element 138, to portion 140.
- FIG. 6 illustrates the edge region 140 being cut at an angle.
- thick felt 130 with treated portion 140 is cut an angle ⁇ , which is typically between approximately 25 and 80 degrees relative to an axis 141 of member 130.
- the angle ⁇ is between approximately 35 and 55 degrees relative to axis 141 of member 130 and most preferably the angle ⁇ is approximately 45 degrees relative to axis 141 of member 130. Cutting the treated edge of the thick felt 130 results in blade 10.
- FIG. 7 shows an example of dimensions of a blade 10 according to the present invention.
- the blade 10 has upper lateral surface 152, which includes treated region 150; first edge portion 154 with treated region 140 and second edge portion 156.
- the blade may have dimensions, such as, for example, the length of portion 154 being between approximately 10 centimeters and 20 centimeters; the height of portion 154 between approximately 0.25 centimeters and 3 centimeters; and the length of edge 156 between approximately 2 and 12 meters.
- Blade stock can be produced at any length and cut down into a plurality of blades of desired lengths.
- FIG. 8 shows an example of an installed blade 10 of the present invention.
- the doctor blade 10 is disposed relative to a belt 182 that is in contact with roller 180.
- FIG. 9 shows a graph 90 of abrasion test results for a general shoe press belt used with a conventional blade and a blade according to the present invention.
- graph 90 has horizontal axis 190, which represents days of operation and vertical axis 192, which represents percent of belt grooves present.
- line 196 the standard blade caused increased deterioration or surface degradation of the belt, particularly after two days of use.
- Line 194 shows that a blade fabricated according to the present invention
Landscapes
- Paper (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/US2005/010613 WO2006118556A1 (en) | 2005-03-31 | 2005-03-31 | Blade apparatus and method of manufacture therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1891268A1 true EP1891268A1 (en) | 2008-02-27 |
Family
ID=35285340
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05731170A Withdrawn EP1891268A1 (en) | 2005-03-31 | 2005-03-31 | Blade apparatus and method of manufacture therefor |
Country Status (11)
Country | Link |
---|---|
US (1) | US20090208706A1 (ja) |
EP (1) | EP1891268A1 (ja) |
JP (1) | JP2008534799A (ja) |
CN (1) | CN101151413A (ja) |
AU (1) | AU2005331294A1 (ja) |
BR (1) | BRPI0520161A2 (ja) |
CA (1) | CA2603196A1 (ja) |
MX (1) | MX2007012000A (ja) |
NO (1) | NO20075498L (ja) |
TW (1) | TW200634204A (ja) |
WO (1) | WO2006118556A1 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102529013A (zh) * | 2012-02-08 | 2012-07-04 | 珠海天威飞马打印耗材有限公司 | 刮刀制作方法 |
EP3334860A1 (en) * | 2015-08-13 | 2018-06-20 | Kadant, Inc. | Planar element for use as a doctor blade or a top plate comprising a three dimensional composite reinforcement structure |
CN108301109A (zh) * | 2018-03-27 | 2018-07-20 | 东华大学 | 一种碳纳米管纤维针织物及其制备方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4978999A (en) * | 1989-04-17 | 1990-12-18 | Xerox Corporation | Fiber reinforced cleaning blade |
US5032229A (en) * | 1989-11-08 | 1991-07-16 | Albany International Corp. | Doctoring device for papermaking machine |
US5110415A (en) * | 1990-04-23 | 1992-05-05 | Albany International Corp. | Composite doctor blade assembly for pulp or papermaking machine doctors |
DE29718387U1 (de) * | 1996-10-25 | 1998-01-22 | Koenig & Bauer-Albert Aktiengesellschaft, 97080 Würzburg | Rakel für eine Rotationsdruckmaschine |
JP2003089993A (ja) * | 2001-09-19 | 2003-03-28 | Ichikawa Woolen Textile Co Ltd | 水切り用ドクターブレード |
-
2005
- 2005-03-31 MX MX2007012000A patent/MX2007012000A/es not_active Application Discontinuation
- 2005-03-31 WO PCT/US2005/010613 patent/WO2006118556A1/en active Application Filing
- 2005-03-31 CN CNA2005800493582A patent/CN101151413A/zh active Pending
- 2005-03-31 US US11/887,296 patent/US20090208706A1/en not_active Abandoned
- 2005-03-31 AU AU2005331294A patent/AU2005331294A1/en not_active Abandoned
- 2005-03-31 JP JP2008504000A patent/JP2008534799A/ja active Pending
- 2005-03-31 BR BRPI0520161-6A patent/BRPI0520161A2/pt not_active IP Right Cessation
- 2005-03-31 EP EP05731170A patent/EP1891268A1/en not_active Withdrawn
- 2005-03-31 CA CA002603196A patent/CA2603196A1/en not_active Abandoned
- 2005-04-13 TW TW094111651A patent/TW200634204A/zh unknown
-
2007
- 2007-10-31 NO NO20075498A patent/NO20075498L/no not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006118556A1 * |
Also Published As
Publication number | Publication date |
---|---|
AU2005331294A1 (en) | 2006-11-09 |
NO20075498L (no) | 2007-12-20 |
US20090208706A1 (en) | 2009-08-20 |
WO2006118556A8 (en) | 2007-11-15 |
MX2007012000A (es) | 2007-12-07 |
TW200634204A (en) | 2006-10-01 |
BRPI0520161A2 (pt) | 2009-04-22 |
CA2603196A1 (en) | 2006-11-09 |
JP2008534799A (ja) | 2008-08-28 |
WO2006118556A1 (en) | 2006-11-09 |
CN101151413A (zh) | 2008-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4482430A (en) | Extended nip press lubricating system for a paper machine | |
EP2711458B1 (en) | Wet paper web transfer belt | |
EP2711457B1 (en) | Wet paper web transfer belt | |
JP3507432B2 (ja) | 製紙用弾性ベルト | |
AU715840B2 (en) | A coater belt and a coating station including such a coater belt | |
EP3133206A1 (en) | Wet paper web transfer belt | |
US20090208706A1 (en) | Blade Apparatus and Method of Manufacture Therefor | |
US7722741B2 (en) | Transfer belt | |
EP2907919B1 (en) | Wet paper web transfer belt | |
US8137507B2 (en) | Shoe press belt for paper-making machine and process for producing the same | |
JP2004036015A (ja) | シュープレスベルト | |
US8449723B2 (en) | Shoe press belt | |
WO2007046968A1 (en) | Apparatus and method for dewatering a fabric | |
KR20080005386A (ko) | 블레이드 장치 및 그 제조방법 | |
EP0944761B1 (en) | Calender provided with an extended nip | |
EP2902545B1 (en) | Wet paper web transfer belt | |
US20090056899A1 (en) | Belt for a machine for the production of web material, specifically paper or cardboard | |
EP3002367B1 (en) | Wet paper web transfer belt, papermaking system, papermaking method and method for producing a wet paper web transfer belt |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20071018 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR |
|
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20100918 |